Rotary pump or blower.



T 0. SIEMEN & w. SIECKE.

ROTARY FUMP 0R BLOWER.

APPLICATION FILED JUNE 11. 1914.

Patented Feb.22,1916.

2 SHEETS-SHEET I.

O'lTO SIElVIEN', OF BERLIN-SIEMENSSTADT, AND WERNER SIECKE,

MANY, ASSIGNORS TO SIEMENS-SCHUCKERTWERKE, G. M. B.

or BERLIN, GER- H or BERLIN,

GERMANY, A CORPORATION OF GERMANY.

ROTARY PUMP on BLOWER.

Specification of Letters Patent.

Patented Feb. 22, 1916.

Application filed June 11, 1914. Serial No. 844,510.

-T 0 all whom it may concern Be it known that we, OTTO SIEMEN, a German citizen, and resident of Berlin-Sle- 'mensstadt, Germany, and lVERxER SIECKE,

This invention relates to a rotary pump or blower of the class having a rotating liquid ring as sealing member between the blade wheel and the casing, which according to the present practice are made of c'y be caused to rotate concentrically insaid casing, so that the chambers formed between the several blades and the interior surface of said liquid ring will expand in radial direction during the suction period, and after having passed the neutral position will contract in radial direction during the pressure period, this radial expansion and contraction being due to the eccentricity of the runner relatively to the casing and there ment at the end of the pressure period. Our

invention is principally designed to obviate this defect by providing a construction, in which the relative arrangement of runner and casing is so modified, that instead of producing a contraction and expansion of the chambers solely in radial direction the expansion and contraction will be made to vary in axial direction also and insuch a manner that during the suction period an axial expansion in the direction away from the suction port or intake and likewise during the pressure periodan axial contraction in the direction toward the outlet port or exhaust will take place. By such arrangement evidently shocks in the fluid to be propelled especially at the start of the suction period and at the end of the pressure period will be avoided and an essentially. higher efficiency of the*device obtained. In this specification we have shown three forms of pumps or blowers by which we attain this feature, viz: firstly, bymaking the central part or hub of the runner of conical shape to provide a space between the hub and the interior of the casing which is crescentic in the direction toward the inlet or exhaust ports; secondly, by a cylindrical construction of the hub of the runner and of the interior of the casing and by vanes or blades of the runner which are mounted obliquely to, the axis; or thirdly, by a cylindrical hub for the runner and an enlargement in the casing of the pump, said enlargement being of such form that a space will be provided between runner and casing which is crescentic toward the inlet and exhaust ports.

In the ordinary construction comprising a cylindrical form of the casing and the runner, at the upper part of the blower, where the distance between casing and runner is a minimum, the ring of liquid will contact with the entire width of the hub, thus necessitating the air contained in the chambers formed by the blades at the moment in which a chamber has arrived at the top. to be discharged from the side wall opposite to the end wall and incase of a double-sided exhaustfrom the center of the runner toward both end walls. By this the effect is secured that the air inclosed in the chambers will be displaced by the parts of the blades dipping first into the liquid ring and thus will be moved toward the end walls. and that the surplus of sealing water may easily discharge.

Our invention will be more fully understood by reference to the accompanying drawings, in which Figure 1 is a vertical section through a blower with a conical runner, said blower being constructed for a one-sided intake iii: 1,1723% and exhaust of. the fluid to be propelled, Fig. 2 a vertical cross-section taken on Fig. 1, Fig. 3 a part of the hub of the runner for two-sided intake and exhaust, Fig. 3? a modification -of the hub of the runner shown in Fig. 3, Fig. 4 a section through a blower having a runner with obliquely disposed blades for atwo-sided intake and exhaust, Fig. 5 a runner of this kind developed out in a plane, Fig. 6 a vertical cross -'section of a construct1on.of our present blower differing from-that of Fig. 1 in that the runner is madecylindrlcal and the interior of the casing of sloping shape, Fig. 7 a vertical section taken. on F1g. 6, Fig. 8 a diagram representing the nterior of the casing of the blower of F igs. Gand 7 developed out in a plane, Figs. 9, 10 and 11 some forms of the interior form-of the casing for a one-sided intake and exhaust, Figs. 12, 13 and 14 similar forms of the interior of the casing for a double-sided intake and exhaust and Figs. 15, 16 and 17 showthe' plane developments of the forms shown in- Figs. 12, 13 and 14 respectively.

According to the construct1ons as shown in Figs. 1, 2,. 4 and 5 the-formation of the chambers and the displacement of the propelled fluid according to our invention are obtained by properly constructing the runner of the blower, while in the ,COIlStI'llCtlOIlS represented by Figs. 6 and 7v the desired edect is attained byproper construction of the casing. Similar reference characters indicate smular parts throughout the several figures of the drawings.

The casing of the blower consists of a ring-like part Mud end walls 0 and b, the

said wall 1) containing openings d and e for intake and exhaust respectively. In the end walls b, 0 the runner f is mounted eccentrically with respect to the axis of the casing. The hub g of the runner is so formed that its diameter is greatest at the end near the wall 0 and smallest near the wall I). The circumference of the h-ubls thus sloping from wall a to wall 6, according to the straight line as shown, it may however also be sloping according to any proper curve if desired.

For illustrating the mode of operation of our present blower we may refer to Fig. 2. The liquid ring which is produced during rotation of the runner by reason of the centrifugal force will closely adapt itself in form to the interior of the casing. In the angular position A the blades it will be dippinginto the liquid ring upon some small length thereof, the hub or central part g'of the runner, however, will not be dipping into said ring, even at the point of its largest diameter, that is the right side of the hub shown in Fig. 1. In the angular position B the hub 9 will come in contact with the liquid ring: at the point of its largest diameter. At the point of smallest diameter, that is on the left side of Fig. l the hub 9 will not be contacting with the liquid ring until the angular position C is reached, that is at the moment when the blades it approach the vertex m of the blower.

By the fact that the hub dips much earlier into the water with its greatest diameter than with its smallest diameter, the medium to be propelled will be pushed toward the end walls as early as at the moment at which the blade reaches the angle B and as soon as the blade h has attained the vertex of the blower, said medium being then comport 6. I

While the arrangement so far described relates to blowers with one-sided intake and exhaust for the medium to be propelled, it is however, as above pointed out also possible to construct blowers with double-sided intake and exhaust according to our invention. In this case the diameters of the hub g forinstance may have a maximum value at the center of the runner and slope toward either side according to a curve'or a straight line as desired.

For attaining the desired effect it is further possible toproperly modify the construction of the blades of the runner. In blowers with one-sided intake andexhaust the blades may be arranged obliquely on the hub, so that the side edges of the wheel facing the end walls will lag in the sense of rotation behind the edges of the wheel of the otherside. In F ig. 4 we have represented an arrangement of this kind for blowers with two-sided intake and exhaust. In this arrangement the center n of the blades is constructed so as to be in advance relatively to the side edges 0, 0 the center n therefore will first enter into the liquid ring, thus causing the displacement of theair first at said center. The action ofthe blades of such construction .is therefore the same as, that of the construction according to the;

runner of Figs. 1, 3 and 3". The same effect can also be attained with blowers having a cylindrical runner in case the interior of the casing 'is made with a corresponding enlargement such as shown in Figs. 6. 7 and 8 fora blower with a one-sided intake and exhaust. f

The surface which interiorly limits the liquid ring will be a cylindrical surface, if the interior of the casing when intersected perpendicularly to the axis forms a surface of rotation. If, however, the interior surface of the casing is made with a one-sided enlargement, the interior surface of the liquid ring will also be formed to correspond to the interior shape of the casing.

A further modified construction according to this invention now consists therein that'the wall of the casing at the side opposite to the end wall I) is enlarged in diameter upon a definite length in such a manner that the enlargement starts about at the side of the casing opposite to the vertex of the blower, gradually increases up to a maximum value at said vertex and gradually decreases again beyond this point.

The enlargement made in the wall of the casing may forinstance start at a point 2 opposite to the vertex m, and increases from here until it reaches its maximum extension at the vertex m. In the diagram of Fig. 8 showing the plane development we have rep resented the cross-sections at the points 1, 2, 3, 4:, 5 and 6. At the points 1, 2 and 6 the cross-section of the wall of the casing is not enlarged, at the point 3 and 5 the enlarge ment is only small, while it'will reach its maximum at point 4, the vertex of the blower. The liquid on the side of the end wall I) (Fig. 6) will assume the form of a circular ring, this form of the liquid being indicated in Fig. '7 in dotted lines. The liquid ring by reason ofthe enlargement of the casing will be limited toward the side of the end wall I) by a curve at the upper end of the end wall I) and ending at the lower end of the wall 0, as shown in 'Fig. 6 of the drawing. The effect of this construction apparently-will be the same as that of the arrangement having a sloping hub for the runner as shown.

Instead of forming the enlargement, for instance according to Fig. 6 other, forms may be chosen'therefor, In Fig; 9 the form of the casing at the vertex of the blower such as corresponds to the blower of Fig. (i is especially represented; this cross-section is gradually decreasing at the vertex over the entire width of the blower. Figs. 10 and 11' show other forms of the slope which are immediately clear from the drawing.

It is of course also possible to construct the blower for a two-sided intake and exhaust for the medium to be conveyed. The crosssection according to Figs. 9 to 11 will then be changed to the cross-sections according to Figs. 12, 13 and 14 respectively, the plane developments of these constructions being given in Figs. 15, 16 and 17.

Having thus described our invention we claim as new and desire to secure by Letters Patent of the United States 1. A rotary pump or blower of the class :chambers during rotation of the pump or blower, which chambers will contract or expand in axial and radial direction simultaneously.

2. A rotary pump or blower of the class specified, comprising a casing, a bladed runner therein, an inlet and an exhaust, said casing and said runner being adapted to produce chambers during rotation of the pump or blower, which chambers will expand in axial as well as in radial direction away from said inlet, and contract in a like manner toward said'exhaust.

cal casing, a bladed runner therein, said 3. ,A rotary pump or blower of the class specified, comprising an essentially cylindribladed runner havin 'a hub or central body which is of conical orm, whereby during a working phase chambers will be formed i which are contracting or expanding in axial aswell as in radial direction.

" In testimony whereof we have hereunto set our signatures in the presence of two subscribing witnesses. r OTTO SIEMEN.

WERNER SIEOKE. Witnesses:

HENRY HASPER, WOLDEMAR HA'UPT. 

